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                        <span class="pk-color-title">Function.length</span>
                        <span class="pk-float-right pk-tip">Core > Object > Function > length</span>
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                        <div class="pk-unit-tag">Description</div>
                        <pre>    函数的length属性指定定义函数时所声明的形参的个数。实际调用函数时，传入的参数个数可以比函数的length属性多，也可以比它少。不要将Function对象和Arguments对象的length属性混淆，后者指定的是实际传递给函数的参数个数。示例请参考Arguments.length。</pre>
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